Pump-operating means for musical instruments.



T. DANQUARD.

PUMP OPERATING MEANS FOR MUSICAL INSTRUMENTS. APPLICATION FILED JULY 6,1909.

1,1 18,476. Patented Nov. 24, 1914.

2 SHEETSSHBET 1.

T. DANQUARD. PUMP OPERATING MEANS FOR MUSICAL INSTRUMENTS.

APPLICATION FILED JULY 6, 1909.

m 2 M A mu 2% m N H & 82 t n w a P Uni w THOMAS DANQUABD, OF NEW YORK.N. Y., ASSIGNGR, BY MESNE ASSIEYNMEHTS, W

AUTO PNEUMATIC ACTIUN (30., OF NEXV YORK.

YORK.

N. 5., A COEEOBELTION OF NEW PUMP-OPERATING MEANS FOR IIIUSIFIELINSTRUIVIENTS.

Application filed July 6, 1909.

To all whom it may concern Be itknown that I, THOMAS Denounce,

. acitizen of the United States, residing at shifting arrangement handyfor the opera tor for making'the change from one to the other; toprovide means connected with the motor for operating the exhaust feedersin such a manner that each of the feeders will commence to be expandedbefore the other has completed its expansive operation, s that thetension or pressure on the motor will be equalized to some extent duringthe revolution of the motor shaft; and to provide means whereby thepower at the beginning of the expansion stroke will be at the maximumand will gradually decrease durthe stroke whereby the natural tendencyin the opposite direction will be counteracted.

Thein ention also involves certain improvenients in construction.

Further objects and advantages of the invention will appear hereinafter.

Reference is to be had' to the accompanying drawings in which- Figure 1is a front view of a portion of a pneumatic musical instrument showing apreferred form of the present invention ap- Specification of LettersPatent.

Patented Nov. Serial No. 506,828.

ing 10. key-bed 11, bottom rail. 12, an. of exhaust feeders or pumps 13.T haust feeders are connected as usual v i the main wind-trunk or brace14;. or the purpose of operating the feeders from. an

electric motor 15 the latter is located at convenient position in thecasing, and drives a main or motor shaft 16 mounted in fixed bearingspreferably located above the rain wind-trunk. On this shaft are locatedtwo operating cams 17, one for each of the pumps. The construction andform of these came will be described hereinafter.

one is in such position as to be able operate a roll 18 on apump-operating lever 19. This lever is movahly supported by link 20 towhich this lever is pivoted near the center thereof and which dependsfrom a support 21 above. .Vith this construction the lever is capable ofswinging bodily toward and from the main wind-trunk 1%. The lower end ofthe lever 19 is shown as engaging a roll 22 on an arm 23 which is fixedon the bottom of the movable leaf of the pump which is to be operated bythat lever.

In order that the cam may operate the operating lever 19 so as to effectthe actua tion of the movable leaf of the bellows, a fulcrum must beprovided preferably between the rollers 18 and 22. For the purpose ofproviding this fulcrum in a movable form the following mechanism isshown. 1

Fixed on the main wind trunk or elsewhere is a bracket 25 shown doubleso that it is provided with a passage through which the lever 19 passes.Pivotally mounted on this bracket or brackets is a lever 26 shown ashaving a roll 27 on the inner end thereof and capable of being movedinto the posi: tion shown in Figs. 2 and 3 in which it on gages thelever 19 and serves as a fulcrum therefor. Mounted under the key'bed isa shift lever handle 30 in convenient position for the operator andsecured on a rod .31 which is adapted to turn and which has an arm 32thereon for operating a link 33 con nected with the lever 26. F turningthis handle the lever 26 can be turned to the position shown in Fig. soas to permit a. spring 35 to force the lever '19 out of the end thereofin yielding contact with the roll 22even independently of the actionwhich the cam 17 has for the same purpose when on its 'lowoperatingside. v

There are two difiiculties in the way of operating musical instrumentmotors or feeders by "constantly rotating motor shafts.

-One is that the tension or pressure on the motor will be very uneven asit .is taxed twice to its IHELXHHIU'I]. capacity on each revolution 'ofthe shaft and it twice arrives at a.-point where only minimum power isrequiredl To obviate this the cam 17 instead of being a regulareccentric or ellipse is of an irregular form and has a rather suddenmaximum rise 37 which gradually decreases during more than half of thecircumference of the cam, and the two cams which operate the two feedersare so set on the,

shaft that the rises 37 are on opposite sides of the shaft so thateach'commences to eX- pand its Yfeederbefore the other cam has ceasedits expansive action on the other feeder. In other words, there willalways be an expansive action on one feeder or the other and twiceduring each revolution both will be expanding, although one of them withvery little force. The other disadvantage to be overcome is that whileexhausting air by'a bellows having flexible sides folded inward, isusually the case, the folds lie nearly'flat against the walls of the twoleaves of the bellows at the beginning of the movement, and thisposition gradually changes until at the end of the movement they arenearly at right angles to the walls. Consequently they ali'ord verylittle resist ance to the. atmospheric pressure at first and very muchat the end of the stroke, and the power requ red to keep the exhaust ata. certain even icnsion varies in the same rsv. It is to olr siatc thisthat tho-abrupt rise is ru'ovided at the beginning ofthe stroke and thegradually diminishing rise througlmut the reu'iain'der. n account ofthis construction the lover 1,) moves faster at the lwginning'of thestroke and slower toward the end so as to equalize the power rcquiredthroughout the stroke. The cam shown in Fig. (l is designedforaccomplishing these results and comparison of the outline thereofwith the dotted line circle will show how the cam can be designed forthese purposes.

In order to make room for the motor 15 at the side the feeders or pumps13 are shown in'l ig. 1 asbeing brought closer tonuance gether than isusually the custom. In order to accommodate this construction and infact any construction in which the feeders are contracted for anyreason, the pedals are so formed that they fold up in front the "pumps.The construction of the pedal mechanism for this purpose forms thesubject matter of my co-pending application filed on even date herewithentitled fold 'ng pedals, PatentNumber 1,008,310 granted Nov. 14:, .1911and reference is to be had thereto for aspecific description thereof.but it may be remarked that in the form shown the pedal l0 is connectedwith a link 41 connected'with the movable leaf of the .bellows by twopivotedlinks l2 and which on account ofbeing pivoted together permit thepedal to be folded up in frent of thebellows as stated above.

While I. have illustrated and described a-preferred embodiment of theinvention, I am aware that many'modifications can be made therein by anyperson skilled in the art without departing from the scope of theinvention .as expressed in the claims. Therefore, I do not wish .to belimited to all the details of constru "ion shown and deto be operativelyconnected with the pumps.

9'. In a device of the character described,

the combination with a pneumatic pump,

pedals, and a motor, of a motor shaft, a lever adapted to operate thepump when it swings on its pivot, means on said motor shaft foroperating the lever, said lever be 'ing movable out of engagement withsaid means, and means for positively moving said lever into operativeengagement with said operating means.

3. In a device of the character described, thc'coi'iibination with apneumatic pump, pedals, and a. motor, of a motor shaft, a lever adaptedto operate the pump when it swings on its pivot, means on said motorshaft for operating the lever, a spring for yieldingly forcing saidlever away from said operating means on the shaft, said lever beingmovable out of engagmnentwith sa d means, and means for positivelymoving said lever into operative engagement with said operating means.

4. In a device of the character desc'ribrd, the combination with apneumatic pump, pedals, and a motor, of a lever for oper ating the pump,means connected with the whereby the position of means for normallydisengaging .1. crating 1t,

second lever out of the named lever, so that the latter will nolongerarrears motor for operating the lever, yielding the lever fromsaid operating means, and manually controlled means for causing saidlever to be placed in operative engagement with the lever operatingmeans.

' 5. In a device of the character described, the combination with apneumatic pump, and a motor having a shaft, of a bracket, a leverfulcrumed on said bracket, a cam on the motor shaft, said lever engagingthe pump and the cam, whereby the rotation of the cam will operate thepump, and means the fulcrum of said lever can be changed to a positionin which the lever (gin move out of engagement with the cam or pump.

6. In a device of the character described, the combination with apneumatic pump, and a motor having a shaft, of a bracket, a leverfulcrumed on said bracket, a cam on the motor shaft, said lever engagingthe pump and the-cam, whereby the rotation of the cam will operate thepump, means whereby the position of the fulcrum of said lever can Y bechanged and the lever can move out of engagement with the cam, and amanually controlled handle for operating said fulcrum changing means.

7. In a device-of the character described, the combination with apneumatic pump, and a pedal connected therewith for opof a bracket, alever fulcrumed on said bracket and having engagement with the pump,whereby when the lever is turned in one direction the pump will beexpanded, a motor shaft, a cam on the shaft adapted to engage the leverto turn it, and a second lever pivoted on said bracket beyond the firstnamed lever and adapted to swing into a position between its pivot andthe first named lever, whereby the end of said second lever will act asthe fulcrum of the first named lever.

8. In a device of the character described, the combination with apneumatic pump, and a pedal connect-ed therewith for operating it, of abracket, a. lever fulcrumed on said bracket, and having engagement withthe pump, whereby when the lever is turned in one direction the pumpwill be expanded, a motor shaft, a cam on the shaft adapted to engagethe lever to turn it, a second lever pivoted on said bracket beyond thefirst named lever and adapted to swing into a position between its pivotand the first named lever, whereby the end of said sec- 0nd lever willact as the fulcrum of the first named lever, and the first named leverwill be forced into operative engagement with the cam, and means forswinging the way of the first be forced into operative engagement withthe cam.

- 9. In a device ofthe-character described, the combination with apneumatic pump, and a pedal connected therewith for op erating it, of abracket, a lever fulcrumed on said bracketv and having engagement withthe pump, whereby when the lever is turned in one direction the pumpwill be expanded, 'a motor shaft, a cam on the shaft adapted to engagethe lever to turn it, a second lever pivoted on said bracket beyond thefirst named lever and adapted to swing into a position between its pivotand the first named lever, whereby the end of the second lever will actas the fulcrum of the first named lever, and the first named lever willbe forced into operative engagement with the cam, a spring for normallyforcing the first named lever away from the cam, and means for movingthe second lever to permit the spring to act.

10. In a device of the character described, the combination with apneumatic pump, of a bracket, a lever fulcrumed on said bracket andadapted to operatively engage the movable leaf of the pump, a pivotedlink connected with said lever for supporting it, a movable fulcrumcarried by said bracket for the lever, a rotary cam adapted to engageand operate the lever when the fulcrum is in a certain position, andmeans for moving the lever out of the path of the cam when the fulcrumis out of said certain position.

11. In a device of the character described, the combination with apneumatic pump, of a lever for operating the'pump,'means for supportingthe lever and permitting it to move to and fro bodily, a movable fulcrumfor the lever, an operating cam adapted to engage and operate the lever,and means for moving the fulcrum to permit the lever to be moved out ofthe path of the cam.

12. In a device of the character described, the combination with apneumatic pump, of a lever for operating the pump, means for supportingthe lever and permitting it to move to and fro bodily, a movable fulcrumfor the lever, an operating cam adapted to engage and operate the lever,and means for moving the fulcrum to permit the lever to be moved out ofthe path of the cam, said cam-having means whereby the lever will bepositively actuated in a direction to expand the pump during more thanhalf of a revolution of the cam.

13. In a device of the character described, the combination with anexhaust bellows or pump, and a pedal connected therewith for operatingit, of a lever adapted to swing on a fulcrum and in position to operatethe bellows when it swings, a motor for operating said lever, andmovable means adjacent to the lever for rendering said lever inoperativeto transmit motion from the motor to the pump.

14. In adevice of the character de'seribtd,

5232soombination withzln exhaust befiows or pump, and a pedal connectedtherewith for operatingit, of a'le'i er adapted to swing on a fulcrumand in position to operatethe bellows .When it swings, a motor foroperating said lever, and means for remov- -1ng the fulcrum whereby thelever Willbe rendered inoperative.

In testimony'wlukeof I have hereumo set THOMAS DANQUARD. Wiinesses WM.P. COLLINS, C. L. JENKINS.

@egrfies ,ei this patent may be obtained for five cents each, byaddressing the Commissioner of Patents.

' Washington, 1). Q3.

